Worst songs to have stuck in your head?

Couple days ago I was listening to the radio on the way to work. Two songs got stuck in my head -- that "Low, Low, Low" song by Flo Rida and a Miley Cyrus song. I refuse to learn the right names of the songs. They were stuck in my head for two freaking days. On an endless loop. I was ready to start punching myself in the liver to deaden the pain.
Anyway, are there two worse songs to have stuck in your head? If there was one song you'd rather stick your face in a meat slicer than have rattling through your brain, what would it be?

This is the song that never ends, it goes on and on my friends. Some people started singing it not knowing what it was, then they kept on singing it forever just because, this is the song that never ends, it goes on and on my friends...

e can dance if we want to
We can leave your friends behind
'Cause your friends don't dance and if they don't dance
Well they're no friends of mine
I say, we can go where we want to
A place where they will never find
And we can act like we come from out of this world
Leave the real one far behind
And we can dance
Dance!

This is the song that never ends, it goes on and on my friends. Some people started singing it not knowing what it was, then they kept on singing it forever just because, this is the song that never ends, it goes on and on my friends...